During the period from July 24 to July 28, 2017, radiological investigations were carried out on the territory of Polistovsky Reserve.
Upper marshes are supplied exclusively with precipitation in the form of rain and snow. However, along with the sediments, various foreign particles can enter the swamp, mainly as a result of atmospheric pollution. Particles of pollutants can be transported in the form of an aerosol for long distances from the epicenter of contamination and fall to the surface together with atmospheric precipitation. Peat deposits of bogs have the property to accumulate substances - peat can be used as an indicator of the degree of environmental pollution, including radioactive elements.
The expedition was attended by employees of Polistovsky and Darwinsky Reserves. The front of the works covered the uninhabited village Ratcha, located on the territory of Polistovsky Reserve, and the surrounding marsh. Also, samples of soil were selected on the island of Lipovaya Gorka and bottom sediments from Kokorevsky lake. The samples will be sent to the laboratory for analysis primarily on the activity of radionuclides: cesium-137, strontium-90, potassium-40, thorium-232, americium-241, etc.
In addition, measurements were made of the equivalent dose rate of ionizing radiation from the surface of the swamp. According to the results of the radiation survey, the radiation background in the vicinity of Ratcha is normal. The level of ionizing radiation averaged 0.1 μSv/h. The level of radiation background 0.22 μSv/h is counted as safe.